OK... here is what I finally decided on a case... NONE!
I have not been a "pocket" guy since phones started getting pretty big, so I settled a few phones ago on cases with matching belt clip holders. (for my last 3 phones) I feel that the ACTIVE is a great size and does not need a case for my normal activities, but I still wanted a belt clip. I looked at several leather pouch type belt clip options but none were easy to remove the phone with one hand.
At Best Buy yesterday I finally tried the Platinum (PT) brand case/belt clip designed for the normal S6. This is the same brand case/clip I used with my S3 and LG-G3. I believe they are made by Seidio as they look identical. With out the case, my ACTIVE fits perfectly in the belt clip. Now I feel that I have the best of both worlds... a rugged phone that does not need a case and a good belt clip to keep it out of my pocket. Unfortunately I now have a case I do not need. But my wife loves that shade of blue, so she might just upgrade to an S6 and use it!
Platinum Holster Case with Kickstand for Samsung Galaxy S6 edge Cell Phones Blue PT-MGS6EHK3L - Best Buy